Same IP issue

I have plans on hosting 10+ blogs on different domains on justhost. Do I have to have different IP's for each domain/blog that I host? How would I go about getting different IP's because I believe my 10+ blogs/domains all share the same ip right now? Will Google penalize for this?

hopefully, my questions are clear.

Depends, are they 10 blogs of the same niche?

If not, I don't think having them on the same IP will matter. Just don't inter-link them.